| Official Name: | Wihan Daeng |
| Native Name: | วิหารแดง |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Saraburi |
| Subdivision Type2: | Tambon |
| Subdivision Type3: | Muban |
| Seat Type: | Seat |
| Established Title: | District established |
| Population Total: | 33883 |
| Population As Of: | 2000 |
| Population Density Km2: | auto |
| Area Total Km2: | 204.5 |
| Postal Code Type: | Postal code |
| Postal Code: | 18150 |
| Blank Name Sec1: | Geocode |
| Blank Info Sec1: | 1904 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 14.3464°N 100.9894°W |
Wihan Daeng (Thai: วิหารแดง, in Thai pronounced as /wí.hǎːn dɛ̄ːŋ/) is a district (amphoe) in southern part of Saraburi province, central Thailand.
Tambon Nong Mu of Nong Khae district was separated to create the minor district (king amphoe) Nong Mu in 1937. The district office was moved to Ban Lam in 1957. The minor district was upgraded tom a full district and renamed to Wihan Daeng on 12 April 1961.[1]
The word Wihan Daeng comes from the Buddhist Red Wihara of Lawa people in Ban Lam area, which was built by red bricks. The Red Wihara does not exist anymore.
Neighboring districts are (from the west clockwise) Nong Khae, Mueang Saraburi, Kaeng Khoi of Saraburi Province, Ban Na of Nakhon Nayok province, and Nong Suea of Pathum Thani province.
The district is divided into six sub-districts (tambons).
| No. | Name | Thai | |
|---|---|---|---|
| 1. | Nong Mu | หนองหมู | |
| 2. | Ban Lam | บ้านลำ | |
| 3. | Khlong Ruea | คลองเรือ | |
| 4. | Wihan Daeng | วิหารแดง | |
| 5. | Nong Suang | หนองสรวง | |
| 6. | Charoen Tham | เจริญธรรม |